I bought this new to build a spare racing engine and ended up selling the race car before I could get the new engine put together. It is new old stock still in the factory plastic. The box has some shelf wear, but the intake has never been ported or installed. These are great high-performance intakes and are no longer being manufactured. It was designed for the first generation SBC with the raised runner heads, such as Brodix, GM 101, or the NASCAR/Pontiac 867 or 434 heads. The runners will not align properly on standard SBC heads without modification. I also have a new set of Fel-Pro gaskets that are included. Single plane. Non-EGR. Please email all inquiries.